How long does it take for the workstations to get their time from the PDC

I just set the time on our PDC. Server 2008
How long before the workstations get this new time?
Can I force the workstations to get the time without going to each one?
Do you need to use an external time source for the PDC or can you just set the clock?

The PDC Emulator in the root domain is generally configured to sync its local clock with an authoritative NTP server. This NTP server may be located on the internet, such as time.windows.com, or it can be a device on your internal network, such as a GPS atomic clock. The PDC Emulators in the child domains will synchronize their time with the root PDC Emulator. Domain Controllers in the domain sync with the PDC Emulator in their respective domains. Clients will then sync their clocks with the DCs in their domain. Time Synchronization is critical for the Kerberos protocol to authenticate successfully.

hope you're still monitoring this. I have three locations. one I enter the command
w32tm /config /manualpeerlist:time.windows.com /syncfromflags:manual /reliable:yes /update. on one of the PDC's then run w32tm /query /source. It states free-running system clock. I tried three times? why wont it change to time.windows.com?

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